}

  public void testTransform_absent_functionReturnsNull() {
    assertEquals(Optional.absent(), Optional.absent().transform(input -> null));
  }

  public void testEqualsAndHashCode() {
    new EqualsTester()
        .addEqualityGroup(Optional.absent(), reserialize(Optional.absent()))
        .addEqualityGroup(Optional.of(Long.valueOf(5)), reserialize(Optional.of(Long.valueOf(5))))

        smb.flags = (byte) ServerMessageBlock.FLAGS_RESPONSE;
        assertTrue(smb.isResponse());
        smb.flags = 0;
        assertFalse(smb.isResponse());
    }

    @Test
    void testEqualsAndHashCode() {
        ServerMessageBlock smb1 = new TestServerMessageBlock();
        smb1.mid = 100;

        ServerMessageBlock smb2 = new TestServerMessageBlock();
        smb2.mid = 100;

            assertTrue(s.endsWith("-7-8"));
        }

        @Test
        @DisplayName("equals and hashCode for equal and non-equal SIDs")
        void testEqualsAndHashCode() throws Exception {
            SID a1 = new SID("S-1-5-21-1-2-3-4");
            SID a2 = new SID("S-1-5-21-1-2-3-4");
            SID b = new SID("S-1-5-21-1-2-3-5");

            assertEquals(a1, a2);

        VERTICAL_VALUES_PAIRED_STATS.xStats().mean());
    assertThrows(IllegalStateException.class, () -> CONSTANT_VALUES_PAIRED_STATS.leastSquaresFit());
  }

  public void testEqualsAndHashCode() {
    new EqualsTester()
        .addEqualityGroup(
            MANY_VALUES_PAIRED_STATS,
            DUPLICATE_MANY_VALUES_PAIRED_STATS,
            SerializableTester.reserialize(MANY_VALUES_PAIRED_STATS))

        VERTICAL_VALUES_PAIRED_STATS.xStats().mean());
    assertThrows(IllegalStateException.class, () -> CONSTANT_VALUES_PAIRED_STATS.leastSquaresFit());
  }

  public void testEqualsAndHashCode() {
    new EqualsTester()
        .addEqualityGroup(
            MANY_VALUES_PAIRED_STATS,
            DUPLICATE_MANY_VALUES_PAIRED_STATS,
            SerializableTester.reserialize(MANY_VALUES_PAIRED_STATS))

    assertThrows(IllegalArgumentException.class, () -> parse(",weakKeys"));

    assertThrows(IllegalArgumentException.class, () -> parse("weakKeys,,softValues"));
  }

  public void testEqualsAndHashCode() {
    new EqualsTester()
        .addEqualityGroup(parse(""), parse(""))
        .addEqualityGroup(parse("concurrencyLevel=7"), parse("concurrencyLevel=7"))

        assertTrue(ex.getMessage().contains("Failed to lookup address"));
    }

    @Test
    @DisplayName("hashCode/equals based on address or server fallback")
    void testEqualsAndHashCode() throws Exception {
        UniAddress a = mock(UniAddress.class);
        when(nsc.getAllByName(eq("server"), anyBoolean())).thenReturn(new Address[] { a });